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Finding the Fourth Proportional to 502.26, 690.66 and 486.90

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Solution

The fourth proportional to 502.26, 690.66 and 486.90 is: 669.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    502.26 : 690.66 = 486.90 : x
  2. Step 2: Convert to fraction form
    502.26/690.66 = 486.90/x
  3. Step 3: Cross multiply
    502.26x = 690.66 × 486.90
  4. Step 4: Simplify right side
    502.26x = 336,282.35
  5. Step 5: Solve for x
    x = 336,282.35/502.26
  6. Step 6: Final answer
    x = 669.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.